Science and Technology. Ping, a pulse of sound in active sonar. Pinging, the noise indicative of improper combustion in internal combustion engines. Ping (Chinese: åª), a Taiwanese measure of area. Ping project, a project of the European Molecular Biology network (EMBnet)
Pre-Market Stock Trading. As its name suggests, pre-market stock trading occurs before the stock market opens up for its regular hours of trading at 9:30 a.m ET. Pre-market stock trading takes place between the hours of 8:00 to 9:30 a.m. ET.
Stock market meaning speculator for a fall is 1709 shortening of bearskin jobber (from the proverb sell the bearskin before one has caught the bear); i.e. one who sells stock for future delivery, expecting that meanwhile prices will fall. Paired with bull from c.1720.